Traditional side bite used for longboards and SUPs or as quad rears. Small traditional longboard side bite designed to add speed, stability, and control to any 2 + 1 set up.. . Glass Flex has been formulated to replicate the flex and memory properties of hand-layered fiberglass. Its advantages over other composite fin materials include stiffness, a more positive flex pattern (nice tip flex, little base flex), and remarkable flex memory. The precision of the injection-molding process ensures the highest accuracy in geometry in each fin produced.. Side Base: 3.45 in.. Side Depth: 3.65 in.. Surface Area: 9.37 in.. Sweep: 30.9. Imported.